src/device/pcix_device.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <device/device.h>
   5 #include <device/pci.h>
   6 #include <device/pci_ops.h>
   7 #include <device/pcix.h>
   8
   9 static void pcix_tune_dev(struct device *dev)
  10 {
  11         u32 status;
  12         u16 orig_cmd, cmd;
  13         unsigned int cap, max_read, max_tran;
  14
  15         if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
  16                 return;
  17
  18         cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
  19         if (!cap)
  20                 return;
  21
  22         printk(BIOS_DEBUG, "%s PCI-X tuning\n", dev_path(dev));
  23
  24         status = pci_read_config32(dev, cap + PCI_X_STATUS);
  25         orig_cmd = cmd = pci_read_config16(dev, cap + PCI_X_CMD);
  26
  27         max_read = (status & PCI_X_STATUS_MAX_READ) >> 21;
  28         max_tran = (status & PCI_X_STATUS_MAX_SPLIT) >> 23;
  29         if (max_read != ((cmd & PCI_X_CMD_MAX_READ) >> 2)) {
  30                 cmd &= ~PCI_X_CMD_MAX_READ;
  31                 cmd |= max_read << 2;
  32         }
  33         if (max_tran != ((cmd & PCI_X_CMD_MAX_SPLIT) >> 4)) {
  34                 cmd &= ~PCI_X_CMD_MAX_SPLIT;
  35                 cmd |= max_tran << 4;
  36         }
  37
  38         /* Don't attempt to handle PCI-X errors. */
  39         cmd &= ~PCI_X_CMD_DPERR_E;
  40
  41         /* Enable relaxed ordering. */
  42         cmd |= PCI_X_CMD_ERO;
  43
  44         if (orig_cmd != cmd)
  45                 pci_write_config16(dev, cap + PCI_X_CMD, cmd);
  46 }
  47
  48 static void pcix_tune_bus(struct bus *bus)
  49 {
  50         struct device *child;
  51
  52         for (child = bus->children; child; child = child->sibling)
  53                 pcix_tune_dev(child);
  54 }
  55
  56 const char *pcix_speed(u16 sstatus)
  57 {
  58         static const char conventional[] = "Conventional PCI";
  59         static const char pcix_66mhz[] = "66MHz PCI-X";
  60         static const char pcix_100mhz[] = "100MHz PCI-X";
  61         static const char pcix_133mhz[] = "133MHz PCI-X";
  62         static const char pcix_266mhz[] = "266MHz PCI-X";
  63         static const char pcix_533mhz[] = "533MHZ PCI-X";
  64         static const char unknown[] = "Unknown";
  65         const char *result;
  66
  67         result = unknown;
  68
  69         switch (PCI_X_SSTATUS_MFREQ(sstatus)) {
  70         case PCI_X_SSTATUS_CONVENTIONAL_PCI:
  71                 result = conventional;
  72                 break;
  73         case PCI_X_SSTATUS_MODE1_66MHZ:
  74                 result = pcix_66mhz;
  75                 break;
  76         case PCI_X_SSTATUS_MODE1_100MHZ:
  77                 result = pcix_100mhz;
  78                 break;
  79         case PCI_X_SSTATUS_MODE1_133MHZ:
  80                 result = pcix_133mhz;
  81                 break;
  82         case PCI_X_SSTATUS_MODE2_266MHZ_REF_66MHZ:
  83         case PCI_X_SSTATUS_MODE2_266MHZ_REF_100MHZ:
  84         case PCI_X_SSTATUS_MODE2_266MHZ_REF_133MHZ:
  85                 result = pcix_266mhz;
  86                 break;
  87         case PCI_X_SSTATUS_MODE2_533MHZ_REF_66MHZ:
  88         case PCI_X_SSTATUS_MODE2_533MHZ_REF_100MHZ:
  89         case PCI_X_SSTATUS_MODE2_533MHZ_REF_133MHZ:
  90                 result = pcix_533mhz;
  91                 break;
  92         }
  93
  94         return result;
  95 }
  96
  97 void pcix_scan_bridge(struct device *dev)
  98 {
  99         unsigned int pos;
 100         u16 sstatus;
 101
 102         do_pci_scan_bridge(dev, pci_scan_bus);
 103
 104         /* Find the PCI-X capability. */
 105         pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
 106         sstatus = pci_read_config16(dev, pos + PCI_X_SEC_STATUS);
 107
 108         if (PCI_X_SSTATUS_MFREQ(sstatus) != PCI_X_SSTATUS_CONVENTIONAL_PCI)
 109                 pcix_tune_bus(dev->link_list);
 110
 111         /* Print the PCI-X bus speed. */
 112         printk(BIOS_DEBUG, "PCI: %02x: %s\n", dev->link_list->secondary,
 113                pcix_speed(sstatus));
 114 }
 115
 116 /** Default device operations for PCI-X bridges */
 117 static struct pci_operations pcix_bus_ops_pci = {
 118         .set_subsystem = 0,
 119 };
 120
 121 struct device_operations default_pcix_ops_bus = {
 122         .read_resources   = pci_bus_read_resources,
 123         .set_resources    = pci_dev_set_resources,
 124         .enable_resources = pci_bus_enable_resources,
 125         .scan_bus         = pcix_scan_bridge,
 126         .reset_bus        = pci_bus_reset,
 127         .ops_pci          = &pcix_bus_ops_pci,
 128 };